I made no secret of my dislike for the "Aubergine" wallpaper in Ubuntu 10.04. If you had asked me when that was released if I thought Ubuntu/Canoncial could come up with something worse, I would have said no.
Unfortunately, I would have been wrong. Ubuntu has revealed the default wallpaper for their 10.10 release. I swear to you, it looks like the inside of a barf bag. Every time I look at it, I get a very strong urge to contribute more to that bag... Take a look for yourself. Read the comments. Ugh. Bletch.
I actually went looking for this, because as part of configuring my new Samsung N150 Plus, I tried the latest daily build of UNE 10.10. When it first came up, I thought there must have been something wrong with the graphic driver. Honesty, it never occurred to me that they would make the screen look like that on purpose!